Experimental study on evolution of waterfilm height during static flash of pure water

Huihui WANG; Dan ZHANG; Qingzhong YANG; Zhaocheng NIU

doi:10.11949/j.issn.0438-1157.20180991

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Experimental study on evolution of waterfilm height during static flash of pure water

更新时间：2020-06-24

- Experimental study on evolution of waterfilm height during static flash of pure water
- CIESC Journal Issue S1, Pages: 54-60(2019)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180991
  CLC： TK 124
- Received：06 September 2018，
  
  Revised：2019-01-11，
- 稿件说明：
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王辉辉, 张丹, 杨庆忠, 牛照程. 纯水静态闪蒸中液膜高度演变的实验研究[J]. 化工学报, 2019, 70(S1): 54-60

WANG Huihui, ZHANG Dan, YANG Qingzhong, NIU Zhaocheng. Experimental study on evolution of waterfilm height during static flash of pure water[J]. CIESC Journal, 2019, 70(S1): 54-60
王辉辉, 张丹, 杨庆忠, 牛照程. 纯水静态闪蒸中液膜高度演变的实验研究[J]. 化工学报, 2019, 70(S1): 54-60 DOI： 10.11949/j.issn.0438-1157.20180991.

WANG Huihui, ZHANG Dan, YANG Qingzhong, NIU Zhaocheng. Experimental study on evolution of waterfilm height during static flash of pure water[J]. CIESC Journal, 2019, 70(S1): 54-60 DOI： 10.11949/j.issn.0438-1157.20180991.

摘要

设计搭建了静态闪蒸实验台，利用高速摄影对不同过热度、节流孔板直径和闪蒸速率下纯水静态闪蒸过程中液膜高度的演变规律进行了实验研究。实验中过热度为7.0~32.5 K，节流孔板直径为5、10、20 mm，闪蒸速率为0.004~0.073 s

-1

。通过液膜膨胀率来衡量和比较液膜高度的变化，液膜膨胀率是指闪蒸过程中液膜实时液位与初始液位的比值。结果表明：最大膨胀率随过热度或节流孔板直径的增大而增大；节流孔板直径一定时，闪蒸速率可通过改变过热度来调节，此时最大膨胀率随闪蒸速率的增大而减小；当过热度一定时，闪蒸速率可通过改变节流孔板直径来调节，此时最大膨胀率随闪蒸速率的增大而增大。最后，根据实验结果拟合得到过热度、闪蒸速率与最大膨胀率的实验关联式，其计算值与实验值吻合良好。本文研究结果对工业闪蒸设备小型化、紧凑化和精细控制提供了重要的实验依据。

Abstract

Experimental study on evolution of waterfilm height during static flash of pure water was carried out with superheat varying between 7.0 K and 32.5 K

orifice diameter at 5

20 mm

and flash speed between 0.004 s

-1

and 0.073 s

-1

. Results indicated that the maximum expansion rate of waterfilm increased with rising superheat or orifice diameter. At given orifice diameter

the flash speed decreased with rising superheat

however

the maximum expansion rate of waterfilm increased with it. At given superheat

both flash speed and the maximum expansion rate increased with increasing orifice diameter. At last

an experimental correlation was set up between maximum expansion rate and superheat

flash speed. The calculated results matched well with experimental data. These results provided a technical support for the miniaturization

compactness and finely control of industrial flash system.

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